Tool



F. ARGENTO.

. TOOL.

APPLICATION FlLED MAR. l0, 1920. 1 ,359:@1 5. Patented Noml. 1920.

l 5.4,. l. i. g5- /17 6l /mmwmf-r--lmmmquwigmw mmm f5 o 14 l Q UNITED STATES FRANCIS ARGENTO, F NEW YORK, N. Y.

TOOL.

Application led March 10, 1920. Serial No.

To all w/wm t may concern.'

Be it known that I, FRANCIS ARGENTO, a subject of Italy, and resident of New York city, in the county of New York and State of N ew York, have invented certain new and useful Improvements in Tools, of which the following is a specication.

This invention relates to tools and particularly to the kind used by engravers for cutting relatively soft material like Celluloid, hard rubber, hard wood and substances of similar hardness.

rThe prirnary object of my invention is to provide a practical, simple and inexpensive tool for engraving at one time a plurality of parallel grooves into an article which is to be ornamented.

Heretofore it was neoessary,.when a number of parallel grooves were to be made, to first engrave a single groove then the next and so on. Such work requires not only great skill, as it is quite truly parallel lines when made in the aforementioned manner, but it also takes considerably longer than if such grooves were to be produced simultaneously, which is one of the objects of my inventio Another object of my invention is to provide such tools with means, whereby the resistance of the material to the cutting operation is greatly reduced. This is accomplished by specially shaping the tools contact surface in such a way as to provide sufficient space for the material to pass by the tool, when the latter is cutting.

nother important object of my invention is to provide guiding means at the lower portion of the tools sides serving asguides for the sharpening stone and assuring the correct working of the tool when cutting.

The foregoing and other objects will be more fully apparent from the' following description and the accompanying drawings, forming part of this specification, in which:

Figure 1 is a side elevation of my tool.

Fig. 2 is an enlarged top view of same.

Fig. 3 is an enlarged bottom view thereof.

Fig. 4 is an end view of my tool showing its cutting edge.

Fig. 5 is an enlarged sectional view taken on line 5*5 of Fig. 1

Fig. 6 is an enlarged sectional view taken on line 6-6 of ig. 1

Fig. 7 is the side elevation vof a modified form of my tool.

Specification of Letters Patent.

difficult to produce Patented Nov. 16, 1920. 364,628.

Figs. 8 and 9 are respectively top and bottom views of the same.

Fig. 10 is an enlarged end view thereof showing its cutting edge.

Fig. 11 represents modified forms of my tool similar to that illustrated in Figs. 4, 5 and 6.

In the drawings, 10 represents the tool body which is slightly tapered at 11 and 12 and terminates at its business end in an acute taper 13, the angle of which varies according to the properties of the material to be cut and the number of grooves to be produced at one time. These two items determine the grade of resistance which is to be overcome by the tool, according to which the lower face is formed.

The sides 14 and 15 are preferably made parallel to provide a guide for the cutting operation.

The upper tool face 16 is provided with a plurality of parallel V-shaped grooves 17 while its lower face 18 possesses also a plurality of parallel grooves 19 the number of which however, is one less than that of the upper grooves. Consequently the size or spread of the lower grooves 19 is larger. These larger spaces serve for reducing the resistance produced in the cutting operation by lessening the cutting contact of the lower tool surface with the material to be cut. lVhile I prefer providing V-shaped grooves, any other shape of grooves may be adapted for different purposes.

s may be seen, the side ribs 20 of the lower cutting surface are of knife-like shape and serve together with the paralled tool sides as guides.

It is obvious that still better results may be obtained by leaving out the central ridge 21 of the lower tool surface leaving but the side ridges 2O for guiding the tool.

In Figs. 11 modified shapes of my device are illustrated showing a single widened groove formed by the side ridOfes 20. For the central ridge a flat surface indicated at 22 is substituted. The single bottom groove may, however, be of various other shapes convenient for reducing resistance.

The end 23 opposite the cutting edge of the tool terminates in a taper to which a handle 24 may be attached.

In order to meet different conditions, the shape of the tool must be altered as is for instance shown in Figs. 7, 8, 9 and 10. This partially as guide for the tool in respect to depth of the cut, produces a Zig-zag cutting edge of considerable advantage to the cutting operation in so far as the resistance to the cutting operation is gradually increased as the tool engages the material to be cut.v Y

First the extreme cutting points of the zig- Zag end enter into the material and prepare the way for the following more blunt edge. In operation it will be found 'that the tool will resist its becoming dull to a far greater degree than tools used heretofore for similar purposes.

Having thus described my invention, l reserve for myself the right to make changes, and to make improvements upon my tool,

to suit different conditions, within the broad scope of my idea for which I claim:

l. A tool for engraving multiple grooves in soft material at one operation, comprising a gradually tapered body having parallel sides, three if-shaped grooves provided at the upper surface of the body, two V-shaped grooves provided at the lower surface of the body, the business end of the tool being acutely tapered at its lower surface thus providing a zig-Zag cutting edge.

2. A tool for engraving multiple grooves in soft material at one operation, comprising a gradually tapered tool body of substantially rectangular cross-section and having two parallel non-cutting sides, a plurality of V-shaped grooves provided at the upper tool surface, a plurality of V-shaped grooves of somewhat larger dimensions than the former provided at the lower' surface of the body, being one less in number than the upper grooves, an acute taper provided at the extreme end of the lower grooved tool face causing the cutting edge of the tool to terminate in a Zig-Zag shape.

/ 3. A cutting tool Vof slightly tapering body having parallel sides, longitudinal grooves provided at its upper surface, similar grooves of somewhat larger size and less in number than the formerprovided at its lower surface, an acute working taper provided at the lower grooved surface terminating the cutting edge of the tool in a Zig-Zag form.

4i. A wedge-shaped cutting tool having a plurality of longitudinal parallel grooves at its Lipper surface, resistance reducing longitudinal grooves of lesser number provided at its lower surface and being of larger size than the former, a working taper terminating the lower grooved surface and producing a zig-Zag cutting edge.

5. A wedge-shaped cutting tool provided at its business end with a Zig-zag cutting edge, parallel grooves provided at its upper surface, similar, but larger grooves of lesser number at its lower surface, the sides of the tool forming at their lower portion parallel guiding edges.

Signed at New York city, in the county of New York, and State of New York, this 3rd day of February, A. D. 1920.

FRANCIS ARGENTO. 

